Aquarium filter



FIG. 1 is a top, front and right side perspective view of an aquarium filter showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a right side elevational view thereof; and

FIG. 8 is an exploded top, front and right side perspective view of a second embodiment thereof, the only difference being that the configuration is a mirror image of the first embodiment. 

The ornamental design for an aquarium filter, as shown and described. 